How do you build a house with columns?

How do you build a house with columns? I've been trying to build a house in the sims 4 to resemble the houses in Willow Creek in the bargain bend lot. Because every time I try and look up a house for that lot in the gallery, they are always expensive, like over 20k. I'm trying to look or build a house for under 20k so that starter sims can live in it. I've tried to look up house building tutorials on YouTube but they're always talking so fast and I can't follow whats going on in the video because they are building fast to! Any ideas would be appreciated!